$ git clone -n https://src.fedoraproject.org/rpms/perl-ReadonlyX.git /var/lib/mock/f45-build-26039-614/root/chroot_tmpdir/scmroot/perl-ReadonlyX
Cloning into '/var/lib/mock/f45-build-26039-614/root/chroot_tmpdir/scmroot/perl-ReadonlyX'...
$ git fetch origin 7e21d43e2a6e16207df739e0eadc83bc3c214cf8:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-ReadonlyX
 * [new ref]         7e21d43e2a6e16207df739e0eadc83bc3c214cf8 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7e21d43 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild